package com.project.erp.servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.project.erp.common.Constants;

/**
 * Servlet implementation class PictureCheckCode
 */
@WebServlet("/PictureCheckCode")
public class PictureCheckCode extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public PictureCheckCode() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Color getRandColor(int fc, int bc)
    {
      Random random = new Random();
      if (fc > 255)
        fc = 255;
      if (bc > 255)
        bc = 255;
      int r = fc + random.nextInt(bc - fc);
      int g = fc + random.nextInt(bc - fc);
      int b = fc + random.nextInt(bc - fc);
      return new Color(r, g, b);
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException
    {
      int width = 60; int height = 20;
      BufferedImage image = new BufferedImage(width, height, 1);

      Graphics g = image.getGraphics();

      Random random = new Random();

      g.setColor(getRandColor(200, 250));
      g.fillRect(0, 0, width, height);

      g.setFont(new Font("Times New Roman", 0, 18));

      g.setColor(getRandColor(160, 200));
      for (int i = 0; i < 10; i++)
      {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(12);
        int yl = random.nextInt(12);
        g.drawLine(x, y, x + xl, y + yl);
      }

      String sRand = "";
      for (int i = 0; i < 4; i++)
      {
        String rand = String.valueOf(random.nextInt(10));
        sRand = sRand + rand;
        g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
        g.drawString(rand, 13 * i + 6, 16);
      }

      request.getSession().setAttribute(Constants.RAND_CHECK_CODE, sRand);

      g.dispose();

      response.setHeader("Pragma", "No-cache");
      response.setHeader("Cache-Control", "no-cache");
      response.setDateHeader("Expires", 0L);

      ImageIO.write(image, "JPEG", response.getOutputStream());
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
      doGet(request, response);
    }

    public void destroy()
    {
    }  
}
